body{
    background-color: #f5f5f5;
}
.font_small{
    font-size: 0.8rem;
}

.my_header, .my_footer{width:100%;}
@media (min-width: 576px) {
    .my_header{
        height: 12rem;
    }
    .my_footer{
        height: 32rem;
    }
}
@media (min-width: 992px) {
    .my_header{
        height: 6rem;
    }
    .my_footer{
        height: 19rem;
    }
}